﻿namespace Yaaf.Wp7.AdvancedExplorer
{
    using System;
    using System.IO;
    using System.IO.IsolatedStorage;
    using System.Threading;
    using System.Windows;
    using System.Windows.Navigation;

    using Microsoft.Phone.Controls;
    using Microsoft.Phone.Shell;

    using Yaaf.Wp7.AdvancedExplorer.ViewModels;

    public partial class App : Application
    {
        private static MainViewModel viewModel = null;

        /// <summary>
        /// A static ViewModel used by the views to bind against.
        /// </summary>
        /// <returns>The MainViewModel object.</returns>
        public static MainViewModel ViewModel
        {
            get
            {
                // Delay creation of the view model until necessary
                if (viewModel == null)
                    viewModel = new MainViewModel();

                return viewModel;
            }
        }




        /// <summary>
        /// Provides easy access to the root frame of the Phone Application.
        /// </summary>
        /// <returns>The root frame of the Phone Application.</returns>
        public PhoneApplicationFrame RootFrame { get; private set; }
        
        /// <summary>
        /// Constructor for the Application object.
        /// </summary>
        public App()
        {
            // Global handler for uncaught exceptions. 
            UnhandledException += Application_UnhandledException;

            // Show graphics profiling information while debugging.
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // Display the current frame rate counters.
                Application.Current.Host.Settings.EnableFrameRateCounter = true;

                // Show the areas of the app that are being redrawn in each frame.
                //Application.Current.Host.Settings.EnableRedrawRegions = true;

                // Enable non-production analysis visualization mode, 
                // which shows areas of a page that are being GPU accelerated with a colored overlay.
                //Application.Current.Host.Settings.EnableCacheVisualization = true;
            }

            // Standard Silverlight initialization
            InitializeComponent();

            // Phone-specific initialization
            InitializePhoneApplication();
        }

        // Code to execute when the application is launching (eg, from Start)
        // This code will not execute when the application is reactivated
        private void Application_Launching(object sender, LaunchingEventArgs e)
        {
            Logger.Instance.WriteLine("Application_Launching, Version: {0}", InfoViewModel.GetCurrentVersionNumber());
        }

        // Code to execute when the application is activated (brought to foreground)
        // This code will not execute when the application is first launched
        private void Application_Activated(object sender, ActivatedEventArgs e)
        {
            Logger.Instance.WriteLine("Application_Activated");
            this.LoadModel();
        }

        // Code to execute when the application is deactivated (sent to background)
        // This code will not execute when the application is closing
        private void Application_Deactivated(object sender, DeactivatedEventArgs e)
        {
            Logger.Instance.WriteLine("Application_Deactivated");
            Logger.Instance = null;
            this.SaveModel();
        }

       

        // Code to execute when the application is closing (eg, user hit Back)
        // This code will not execute when the application is deactivated
        private void Application_Closing(object sender, ClosingEventArgs e)
        {
            Logger.Instance.WriteLine("Application_Closing");
            Logger.Instance = null;
        }
        
        public void LoadModel()
        {
            if (IsolatedStorageSettings.ApplicationSettings.Contains("CurrentDirectory"))
            {
                ViewModel.ExplorerView.CurrentDirectory = new WP7.NativeAccess.IO.DirectoryInfo((string)IsolatedStorageSettings.ApplicationSettings["CurrentDirectory"]);
            }
        }

        public void SaveModel()
        {
            if (IsolatedStorageSettings.ApplicationSettings.Contains("CurrentDirectory"))
            {
                IsolatedStorageSettings.ApplicationSettings["CurrentDirectory"] = ViewModel.ExplorerView.CurrentDirectory.FullName;
            }
            else
            {
                IsolatedStorageSettings.ApplicationSettings.Add("CurrentDirectory", ViewModel.ExplorerView.CurrentDirectory.FullName);
            }
        }

        // Code to execute if a navigation fails
        private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
        {
            System.Windows.MessageBox.Show(e.Exception.ToString());
            if (System.Diagnostics.Debugger.IsAttached)
            {
                // A navigation has failed; break into the debugger
                System.Diagnostics.Debugger.Break();
            }
        }

        // Code to execute on Unhandled Exceptions
        private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
        {
            var data = e.ExceptionObject.ToString();
            var errorMessage = string.Format("Unhandled Exception!!! (Data: {0})", data);
            Logger.Instance.WriteLine(errorMessage);
            var dis = ((App)Current).RootFrame.Dispatcher;
            if (dis.CheckAccess())
            {
                var result = MessageBox.Show(
                    errorMessage + "\n Do you want to ignore that error?",
                    "Ignore Exception?",
                    MessageBoxButton.OKCancel);
                if (result == MessageBoxResult.OK)
                {
                    e.Handled = true;
                }
            }
            else
            {
                bool wait = true;
                var op = dis.BeginInvoke(
                    () =>
                        {
                            var result = MessageBox.Show(
                    errorMessage + "\n Do you want to ignore that error?",
                    "Ignore Exception?",
                    MessageBoxButton.OKCancel);
                            if (result == MessageBoxResult.OK)
                            {
                                e.Handled = true;
                            }
                            wait = false;
                        });
                while (wait)
                {
                    Thread.Sleep(500);
                }
            }

            if (System.Diagnostics.Debugger.IsAttached)
            {
                // An unhandled exception has occurred; break into the debugger
                System.Diagnostics.Debugger.Break();
            }
        }

        #region Phone application initialization

        // Avoid double-initialization
        private bool phoneApplicationInitialized = false;

        // Do not add any additional code to this method
        private void InitializePhoneApplication()
        {
            if (phoneApplicationInitialized)
                return;

            // Create the frame but don't set it as RootVisual yet; this allows the splash
            // screen to remain active until the application is ready to render.
            RootFrame = new PhoneApplicationFrame();
            RootFrame.Navigated += CompleteInitializePhoneApplication;

            // Handle navigation failures
            RootFrame.NavigationFailed += RootFrame_NavigationFailed;

            // Ensure we don't initialize again
            phoneApplicationInitialized = true;
        }

        // Do not add any additional code to this method
        private void CompleteInitializePhoneApplication(object sender, NavigationEventArgs e)
        {
            // Set the root visual to allow the application to render
            if (RootVisual != RootFrame)
                RootVisual = RootFrame;

            // Remove this handler since it is no longer needed
            RootFrame.Navigated -= CompleteInitializePhoneApplication;
        }

        #endregion
    }
}